Edgeware’s Cavena-based subtitling system for file-based play-out insertion is used to make sure the right subtitle files with the correct language, format, timing and positioning are inserted to the broadcast feed. File-based subtitle play-out implies there is a stored subtitle file to be associated with the asset being played out. This file consists of text and timecode, where timecode is the IN and OUT time for each subtitle row. Integration with Automation play-out systems guarantees the files are scheduled and played according to playlists.
A key part in the file-based play-out subtitling system is the Cavena Subtitle Transmission Unit (STU). The STU can play-out the subtitles in one or more formats in parallel, for example DVB Bitmap and Teletext. Each output is frame accurate thanks to the capability in the STU to support different timing for different output ports.
Subtitling System for File-based Play-out
WHAT IT DOES
- Aligns the timecode of the subtitle text (accurate IN and OUT time for each subtitle row) with the timecode of the video
- Retrieves the video timecode from the SDI signal, SD or HD, or over IP
- Sends aligned subtitles in the formats required, such as DVB, Invision/burned in etc
- Adds timecode to live subtitles when coming into the STU, and the subtitles are then stored with timecode and ready for later re-runs
Subtitling System for File-based Play-out
HOW IT WORKS
- Subtitle files stored in the Cavena-based Subtitle Archive Manager (SAM) are retrieved by the Subtitle Transmission Controller (STC) upon command from the broadcaster’s automation system, often days in advance.
- The subtitle files are sent to the Subtitle Transmission Unit (STU).
- The STU is capable of playing out multiple language files per event in one or several formats, e.g. DVB bitmaps, Invision/burned in/open captions or inserting EBU teletext as VBI for SD and as VANC for HD. EBU teletext in HD is commonly wrapped in OP-47.
Subtitling System for File-based Play-out
HOW TO DEPLOY
Edgeware’s Cavena-based subtitling system for file-based play-out insertion runs on Windows OS and on any commercial server. Pending input and output format requirements, servers may need 3pp boards to read the timecode from an SDI signal or sending ASI signals as output.
Proof of Concepts (POCs) are easy to set up and a normal sized installation does not take more than one week to deploy.